Exactly what is Aerosol hearth extinguishing

What exactly is aerosol fire extinguisher? Aerosol fireplace extinguishing technological know-how is a completely new kind of fire extinguishing engineering produced on The premise of navy pyrotechnics.

The first era of aerosol hearth extinguishing technological know-how was born within our nation, often known as smoke hearth extinguishing engineering, which began in the early sixties. It absolutely was finished by scientific researchers from the Tianjin Hearth Analysis Institute of Community Safety, who independently made an automated smoke hearth extinguishing procedure, which is principally used to extinguish fires in Class A, B, and C liquid storage tanks.

Inside the early 1980s, Along with the emergence of environmental security difficulties of “halon fire extinguishing agent”, locating options to halon grew to become an essential analysis topic.

At the end of the nineteen eighties, Russian scientists very first succeeded in researching aerosol fire extinguishing technological innovation that can extinguish fires inside of a submerged way, which opened up a whole new way for halon substitution study. Subsequently, aerosol hearth extinguishing technological know-how has attracted the eye from the Worldwide community, and countries which include China, the United States, Australia, Malaysia along with other nations around the world have also begun investigate on new aerosol hearth extinguishing systems.

Generally speaking, aerosol is a stable point out procedure formed because of the dispersion of fantastic strong or liquid particles in a very fuel. Skillfully, it refers into a colloidal method that takes advantage of gas (commonly air) since the dispersion medium and strong or liquid particles as the dispersant.Common aerosols in character—clouds, smoke, fog, and many others.The dimensions with the particles in aerosols is usually within the order of ten-five to ten-1μm, which has gasoline fluidity and might diffuse all-around obstructions.

The medicament during the aerosol fire suppression program system is sound, plus the part emitted because of the medicament throughout the oxidation-reduction response is aerosol. The very first generation of aerosol hearth extinguishing engineering-smoke fire extinguishing engineering.

K-sort aerosol hearth extinguisher, also known as potassium salt fireplace extinguishing technological innovation, is the next phase of the development of aerosol hearth extinguishing engineering, which started in the former Soviet Union in the mid-nineteen sixties. Our nation begun late in this regard, beginning in the early 1990s.

In such a aerosol making agent, potassium nitrate is principally utilized as the most crucial oxidant. Its sprays have significant hearth extinguishing performance, but since they include a large amount of potassium ions, Simple to absorb moisture, forming a yellow and sticky robust alkaline conductive liquid film, this substance may be very harmful to Digital devices, so K-style aerosol automated fire extinguishing unit can’t be used in Digital machines, precision instruments and cultural relics Archive place. At present, the use out there is progressively decreasing.

The third-technology aerosol (S variety) is mainly fabricated from strontium salt as the key oxidant. In contrast to the 2nd-technology potassium salt (K-kind) aerosol, strontium ions will not take up moisture, will not variety a conductive Remedy, and will likely not induce damage to electrical gear. In 2001, China Cell Communications Corporation picked the strontium salt aerosol (S-variety aerosol computerized fire extinguishing unit) produced by the corporate following rigorous inspection and verification to shield its conversation foundation stations together with other destinations equipped with subtle Digital equipment.

At present, strontium salt aerosol products are already utilized in 1000s of engineering projects, plus the 3rd-technology aerosol has grown to be Progressively more acknowledged by customers

Aerosol fireplace extinguisher application selection

a. Electrical fire

Conversation area, interaction base station, electronic computer home, and many others.;

Electrical fires in destinations containing precision instruments and gear, which include energy distribution rooms, generator rooms, cable interlayers, cable wells, cable trenches, etc.

b. Good surface fireplace

Surface area hearth of combustible good components in spots the place combustible good components are employed or saved.

c. Liquid fire

Liquid fires in locations where by diesel oil is produced, utilized or stored (except -35 diesel), large oil, transformer oil, animal and vegetable oil and various flammable liquids of Classification C; Prior to extinguishing a fuel hearth, the gasoline supply is usually cut off.

Aerosol fireplace suppression technique application .

d. The S-sort aerosol hearth extinguishing machine can’t be used to set out the subsequent fires

①Substances that may be oxidized without the need of air, for instance nitrocellulose, gunpowder, and many others.; active metals, which include potassium, sodium, magnesium, titanium, and many others.; compounds which will decompose by on their own, for example specified peroxides, hydrazine, etc. Metal hydrides, like potassium fluoride, sodium hydride, and so forth. Organic substances, including phosphorus. Robust oxidants, such as nitrogen oxide, fluorine, etcetera.

② Deep fire of combustible sound supplies.

③ Fire in crowded locations, for example theaters, auditoriums, etcetera.

④ Hearth in locations with explosion hazard, including workshops with explosive dust.

⑤ Extremely-clean up natural environment, which include pharmaceutical workshops, chip processing sites, medical rooms, and so on.

Aerosol fireplace extinguishing working principle

The 4 aspects of combustion: combustibles, oxidizer, temperature and uninhibited chain response. The fireplace extinguishing system of hearth extinguishing gas would be to reduce just one or a number of with the 4 factors of combustion.

The solid hearth extinguishing agent from the S-style aerosol fireplace extinguishing unit is began by energy, and it undergoes redox reaction to variety a lot of agglomerated fireplace extinguishing aerosols, and its composition is mainly N2, a small level of CO2, and steel salt reliable particles.

Aerosol hearth extinguishing system is as follows

Mechanism of endothermic cooling and fireplace extinguishing

Metal salt particles absorb a large amount of warmth at superior temperatures, and undertake Bodily endothermic procedures for instance thermal melting and gasification. The flame temperature is decreased and after that radiated for the combustible combustion floor for gasification of combustible molecules and vaporized combustible molecules. The heat of pyrolysis of combustion molecules into totally free radicals will reduce, along with the combustion response pace is going to be suppressed to a particular extent.

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